Manhole door



G.G.MUSTED MANHOLE DOOR Filed June 2, 1920 Patented duly l?, l923.

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Application nea time e, 192e. seran No'. 385,983.

To all whom t may concern.:

Be vit known ythat l, GEORGE GORDON Musician, afsubject of the Kingof Great Britain and Irelandand the lsle of Man9 and a resident of Partick, Glasgow-j Scotland, have invented new and useful lmprovements in Manhole'Dooraof which the following is a specification. 1

This invention has reference to improvel@ ments-in manholeand like doors for water ballast,` oil and other tanks, andcoinpartments,` and for other purposes, such vas gasometers, boilers, floating "necks, dock gates, pump casings,. vsuction and water 155 pipes, ice breakers, tunnels of ships, hatch openings, shell openings, and cattle doors, and particularly relates to that type of manhole and like door.7 in which the securing bolts secured to the door doy not pass through the plating but pass vthrough the door opening in the plating adjacent to the edge of same and also through holes formed in a securing ring and are tightened by nuts screwing on to the bolts and bearing against the ring.

According to this invention the door consists of a plate `provdedwith a depressed and flat central portion and an elevated and flat rim portion formed by joggling the of the ring plate towards the adjacent surface of the door plate. yThese recesses are provided with bottoms pierced for the passage of the securing bolts which are secured to the door plate. When fitted into place that portion ofy the plating round the door opening is sandwiched between the flat ele,- vated rim part of the door plate and that part of the sectional ring plate outside or beyond the recesses. The length of the securing bolts is such that the ends of same do not project beyond the Outer surface of the ring plate when the nuts are screwed on to the ends of same.

To facilitate the manipulation of the door a lhandle is secured to the central part of same and lies under the securingring plate within the open central part of same.

The above door is semi-flush with the plating in which the door opening is formed,

plate along a line concentric with the outerv central part of same.

that is, all that projectsv beyond the vplating is ,the edge ofthe securing ring., To make the door dead-flush with theplating a strengtheningring is secured under the plating' and projects inwards all round thel door opening. yThis strengthening ring is sandwiched between thedoor plate and the securing ring so that vthe upper surface. of

the securing ring is.fliishwvith the plating. The depth of'therecesses inthe securing .ring andthe depths-or amount ofv the joggle on the -door plate is 'such thatwhen the doork is bolted up there jis a small clearance space between the bottom of the recesses and the surface of the door plate.

ln order that othersskilled in thevart to which this invention relates may perfectly understand same l have-hereunto appended one sheet of drawings iny which z.-l Y.

"Figure l is a sectional elevation of a-rnanf hole door as constructed according' to this invention and illustrates a dead-flush door.

Figure 2 is a plan view of same.

Figure 3 is asectional elevation similar to Figure 1 but illustrates the semi-flush door. y l

Referring to these drawings l In carrying this invention into effect or practice a flat, oval-shaped door plate'is formed with a joggle at the part a so that a flat depressed central surface b and a flat elevated rim surface 0 are provided. A securing ring d made in preferably two sections is formed with a 'plurality of recesses 'e i which are each formed byy a circular pendant wall f projecting from the inner surface g of the ring plate d towards the surface b of door plate.

Bolts it secured into the door plate pass, freely through holesl formed in the bottoms z' of the .recesses e. Nuts j screwing on to the bolts h are located in the recesses e. A. strengthening or compensating ring 7c is secured to the plating Z round the door opening m and projects inwards all round the opening. The inwardly projecting part 'n of this ring 7c is sandwiched between the part c of door plate and the part o of securingring plate d beyond the recesses e."

An operating handle p fitted to the door plate lies under the ring Z and within the Suitable packing g is inserted tor make kthe door water, oil or gas tight.

In the .semi-Hush door as'illustrated by .exception that the rng'lJ is` dispensed With.

y What I claimv and ters PatentiQ-'- i l. Manhole and like.' doors com-prisi-ng;v tank or other plating; a door opening therein; a door plate; a joggle, formed in said:` f door platev concentric With the outer edge of same; at iiatelevated" rim part and a flatl depressed central part in sa'id door plate; a

ring plate; a plurality .of recesses 'inv the` vouter J surface `of saidring `fp`l-ate and near the edge thereof; circular pendant Walls;

forming said recesses; projectingroin said 1ing"plate-, towards ksaid ydoor plate; bolts secured" 'in said" door plate and passing through the pierced bottoms of said re-y cesses; ynuts onv said bolts located in said recesses;fand 'an operating handlelocatedV underv said `ring` `plate yWithin the open` cenl ter-part of saine. 1 i

2. Manhcle and like doors comprising tan-k or other plating; a door opening,` therein; a door plate; a joggle7 formed 'in said doorl plate concentric with the 'outer edge of `sanr1,e;aiat elevated riin partandarlat depressed-.central partin`- .-sa=id door plate;

` a ring plate; a-plur'al-ity o -f recessesy inthe desire to secure by Let;v c

` 'said recesses;nuts on "said-` bolts located in ypendant Walls; forming saidgrecesses; pro

jectingwfrorn said'. ringjplate 'towards said door plate; bolts secured in said door plate and passing through the pierced bottoms of said recesses; a strengthening'ring secured totheplating and projecting inwards` all round the said door opening; andan "operating handle located under said'ring plate Within the openncenter part Qtsaine.v

SQManbole and rlike -doors comprising tank 0r otherplating door. `opening therein; al door plate; a --jog;'gle; `formed'in'sad door plateconcentric `with theouteredge, of z.

theu saine; a" `fiat elevatedrim` partand a Lio' fiat depressed central part fin said door plate; a ringv plate rcoin'prising a plurality of independent parts; La vpluralityv yotrecesses in the outer'surfacehot'each of" 4 said independent 4parts; ci-icular-pendant Walls, forming said` recesses; ,projecting from ,said ring; plate l towards said'door plate ;.bol=,ts

secured inf'said ,door-i, plate and passing vthrough the pierced bottoms otfsaidrecesses; nuts on said bolts located in'vsaid recesses; and an operating handle located under said ring terpartof saine.

f esoneri ,coRDoNfMUs'TnDgnq platek vWithinv the :open cene 

